An electric junction box is provided. A second upper cover includes a second body wall covering an upper opening of a housing on a side rearward of a first partition wall, and a first waterproof rib standing upward from a front end of the second body wall. The first waterproof rib is arranged between the first partition wall and a first peripheral wall. The second upper cover includes a second waterproof rib standing upward from the second body wall. The second waterproof rib is arranged rearward of the first peripheral wall.
